Pat Leiggi (right) of the Museum of the Rockies prepares to move a leg bone of the T. rex at the Smithsonian's Natural History Museum in Washington, D.C., on Tuesday. Maggie Starbard/NPR hide caption

toggle caption Maggie Starbard/NPR
Courtesy of Bob Walters

Magellanic penguins strut their stuff on the rocky shoreline of Argentina's Punta Tombo, home to the largest colony of the birds in the world. Craig Lovell/Corbis hide caption

toggle caption Craig Lovell/Corbis

A close-up schematic of leaks near the U.S. Capitol shows high leak densities east of the building, but few leaks over the National Mall, where very few natural gas pipelines exist. Robert B. Jackson/Environmental Science and Technology hide caption

toggle caption Robert B. Jackson/Environmental Science and Technology

Ask not for whom the wolf stalks ... Holly Kuchera/iStockphoto hide caption

toggle caption Holly Kuchera/iStockphoto

Say aaaaaah! Dental caries and other signs of oral disease are plain to see in the upper teeth of this hunter-gatherer, between 14,000 and 15,000 years old. The findings challenge the idea that the original paleo diet was inherently healthy, says paleo-anthropologist Louise Humphrey. It all depended, she says, on what wild foods were available. Courtesy of Isabelle De Groote hide caption

toggle caption Courtesy of Isabelle De Groote

Even when a flood obliterates homes, as Superstorm Sandy did in 2012 in the Rockaway neighborhood of Queens, N.Y., the urge to rebuild can be strong. Spencer Platt/Getty Images hide caption

toggle caption Spencer Platt/Getty Images

In Jiaonan county, the Qi wall incorporates outcrops of bedrock. Linda Nicholas/The Field Museum hide caption

toggle caption Linda Nicholas/The Field Museum

The Brazilian agricultural sector exported for a value of $94,590 million in 2011. One of its largest exports is soybeans, like these in Cascavel, Parana. Werner Rudhart/DPA /Landov hide caption

toggle caption Werner Rudhart/DPA /Landov

Research excavations like these in Siberia's Denisova Cave are yielding clues to the mating choices of early hominids. Bence Viola/Nature hide caption

toggle caption Bence Viola/Nature

Sediment samples from the seafloor near Long Island. UT Austin Institute for Geophysics hide caption

toggle caption UT Austin Institute for Geophysics

The EPA tries to keep track of all sorts of methane producers — including herds of methane-belching cattle. Emmett Tullos/Flickr hide caption

toggle caption Emmett Tullos/Flickr

NPR thanks our sponsors

Become an NPR sponsor